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wow... great!! thanks ^^ i will try this at weekend and report the result. have a good day :)

thans for your very useful information. i will investigate 74F253S. and which one is PAL ? Please tell me more about PAL. did you mean ASG? i can't find PAL on my logic board. WIKIPEDIA say that about PAL  - BMU0/1, TSM, TSG,LAG,..... RIGHT? Thanks again, techknight. :)

you may need 512k board than plus. when i try to replace LS166 with plus's ic, it does not works. i hope you get the result finally. thanks for reading.

wow.. same pattern on the screen. :) before i replaced the LS166 that pattern was on my screen. 100% same thing. even if i could not find culprit too, i guess you need to replace the LS166, LS244. the path is "ram-ls166-ls244-cpu" so we need to focus this line first. good luck!!

i replaced all of it, but i did not use new ram. that is the reaseon why apple logo still there. every ram was tested on the another board using the slot. (i mean 16 number of ram, not 16$ :) ) Elfen // thanks for your comment. i also think about that. "adjusting voltage and brightness."...

.ㅁ

i replaced all of it, but i did not use new ram. that is the reaseon why apple logo still there. every ram was tested on the another board using the slot. (i mean 16 number of ram, not 16$ :) ) Elfen // thanks for your comment. i also think about that. "adjusting voltage and brightness."...

Yep. here it is. if it is not enought to figure out something, i wll take it again using the camera. thanks.     the red sopt is what i replaced from 512k board.  

thanks for your comment. I had replaced two LS244 and ASG, but anything was changed. so i decided to replace more thing. when i replaced a LS166 beside of ram the screen was changed.   i will try more about replacing the ic, i will report the result. thanks.

i finished replacing the ram. (16ea) i found that this computer  booting nomally except the screen. just screen is not nomall. screen was not changed, still has vertical lines. i cant hear bong sound because sound was too low (soft?). i guess this is not about ram problem. do you have any...

thanks for your comment. i have a question. there are no bong sound and error code. in this case the problem will be "ram"?

hello! recently i got a another 128k. i like best 128k. and this is my 4th 128k. :) but it has some problem on the logic board. there are no bong sound, but something was came up on the screen. maybe ram problem? anther issue? thanks for reading. nomally this pattern was on the screen...

yep. socket make some issue actually. ram was not just fit with socket, and sometimes i had to push the ram. i will remove it all some day. thanks. :)

thanks :)

here is some update. i just got smile mac with nomal bong sound. :) i had replaced the 10 ram and 1 74s244. but actually 74s244 was not problem. the problem was just ram only. more than 3ram was unnomal. thanks for everyone's help. :) have a good day!!

just one i replaced. which was near the cpu. i have to replace one more ? thanks for reading.

I did replace the 74ls244 and then errorcode was chaged to "020002". (i guess your comment was right, it was broken 74ls244.) so i also replaced the F6 Ram. now it show the errcode "04FFFE". :(

I did replace the 74ls244 and then errorcode was chaged "020002". so i also replaced the F6 Ram. now it show the errcode "04FFFE". :(  

yep. there are not floppydisk in the drive. so maybe its not reason for bad floppy disk. thanks. :)

yep i'll try it today. i wonder if it compatible with 512k's 74ls244 ?